Reaming attachment for connecting rod-babbitting and boring machines



Jan. 2l, 1930. H. c. sHoEMAKER REAMING ATTACHMENT'FOR CONNECTING ROD BABBITTING AND BORING MACHINES Filed June 8, 1927 Patented Jan. 21, 1930 UNITED STATES HARRY C. SHOEMAKER,

REAMING ATTACHMENT FOR CONNECTING Application filed .Tune S,

This invention relates to a reaming attachment especially designed for application to a connecting rod babbitting and boring machine of the type shown in my co-pending application Serial No. 61,942, for increasing the range of uses to which the machine may be put and thereby better suit the needs of garages, auto repair shops and small machine shops, or wherever a machine of this particular type or any other small machine of a similar type may be used, the particular reamer attachment when provided on a machine of the type referred to being intended for use in the reaming of piston pin bushings, although of course, it may be employed for the large variety of reaming operations encountered in autorepair work.

According to the present invention, I provide a bracket extension arranged for easy attachment to the bracket of the babbitting machine and replace the ordinary stub shaft of the driven pulley with a longer shaft to serve in the capacity of a countershaft, providing at one end the same drive as before with the boring spindle and bearing at its other end in the bracket extension where a chuck spindle for driving a reamer or the like is mounted and arranged for detachable driving connection with the countershaft so that the same may be thrown into and out of operation at will.

The invention is illustrated in the accompanying drawing, wherein Fig. 1 is a front view of one end of a babbitting machine of the kind referred to, showing my reamer attachment;

Fig. 2 is a right side view of the attachment; and

Fig. 3 is an enlarged Vertical sectional detail showing the detachable driving connection between the countershaft and the chuck spindle.

The same reference numerals are applied to corresponding parts throughout the views.

The present invention is of course applicable with minor variations to a large variety of small machines to broaden thel range of usefulness thereof, and no special limitation should therefore be consideredy 'as imposed 'l upon the invention by reason of its being ile PATENT OFFICE OF FREEPORT, ILLINOIS ROD-BABBITTING AND BORING MACHINES 1927. Serial No. 197,285.

lustrated as applied to a connecting rod babbitting and boring machine. While the present attachment has been designed especially for application to a machine of the type referred to, it will be obvious that it would afford similar advantages in many other cases wherever it becomes necessary to perform reaming operations. In auto repair work a reamer of the present type is practically indispensable. Since the particular details of the babbitting machine are relatively unimportant, a brief description thereof will suf- The machine comprises a base 6 arranged to be mounted and fastened by the pads 7 on the top of a bench or other suitable support at a convenient elevation for operating the machine. A tail block 9 is adjustable lengthwise of the base to suit different lengths of connecting rods. The rod to be babbitted is arranged to be supported by its wrist pin between V-blocks 10 and clamped by the screws 11. The crank pin end has elongated or so-called extension nuts arranged to be clamped at 12 so that the crank pin end is coaXially arranged relative to a table 13. there being still another clamp at 14 to grip the rod intermediate the ends thereof. The table 13 is arranged for elevation to a point directly beneath the rod and is then clamped by the hand screw 15. While the table is in this position the'babbitt is poured about a mandrel as fully set forth in my copending application above referred to. Following the pouring operation, when the babbitt has hardened, the mandrel is removed and the table 13 dropped to the position shown so that the crank pin end of the rod lies freely exposed for the boring spindle 16 to operate therein. This spindle is rotatably mounted in bearings 17 provided on a bracket 18 mounted for up and down and swinging movement on the standard 19 eX- tending vertically at the rear of the base 6. Up and down feeding of the spindle is secured by turning the hand wheel 20 to turn the screw 21 in a nut 22 provided on the bracket 18. In other words, the bracket moves with the spindle as a unit. Thus when the bracket is swung relative to the standard the spain@ may te taught in@ and @i were Cil ing position relative to the base 6. A motor 23 is supported on the bracket 18 and has a pulley 24 on the armature shaft thereof over which a belt 25 is passed to drive the pulley 26 on a countershaft 27 received in a bearing 28 provided on the bracket 18. A cover plate 29 conceals a bevel gear connection between the end of the countershaft 27 and the adj acent upper end of the boring spindle 16.

According to the present invention a bracket extension, designated generally by the reference numeral 30, is provided on the bracket 18 to afford an additional power take-off to a chuck spindle 31 off the countershaft 27 to drive the chuck 32, arranged to hold a reamer or any other tool which it may be found convenient and practical to operate in the present manner. In the absence of the present invention the shaft 27 is a stub shaft so that it becomes necessary in the application of my attachment to rep-lace the stub shaft by a longer shaft to extend from the bearing 28 into and through bearings in a housing 33. The latter constitutes one of three principal parts of which the bracket extension is composed, the other two parts being` a U-shaped connecting yoke 34 bolting at its ends, as at 35, onto the housing 33 and the bearing 28 of the bracket 18, and a J-shaped underarm 36 bolting at its ends, as at 37, to the housing 33 and to the side of the bracket 18. The spindle 31 is received in a bearing 38 provided on a cover plate 39 fastened to the front of the housing 33. The chuck 32 is fixed on the outer end of the spindle, and a worm gear 40 is keyed to the inner end thereof within the housing 33. A worm 41 meshing with the worm gear 40 is fixed in any suitable manner to a sleeve 42 mounted freely on the end of the shaft 27. The sleeve 42 provides a bearing for the shaft in the housing 33 and is received at one end in' a bearing opening 43 in one side wall of said housing. The worm 41 is received in a bearing opening 44 providedin the opposite side wall of said housing. The projecting end of the sleeve 42 is enlarged as at 45 and has 'pins 46 projecting from the end face thereof. These pins constitute the means for driving the worm 41 when they are engaged by pins 47 projecting from the opposed face of the hub of a hand wheel keyed as indicated at 49 for endwise movement on the end of the shaft 27. A pin 50 in the end of the shaft 27 serves to retain the hand wheel 48 against removal from the shaft. j

It is believed to be clear from the description that the chuck 32 has a detachable driving connection With the shaft 27 controlled by the hand wheel 48. lI`he latter normally turns idly with the shaft 27 whenever the motor 23 is running, as for example, during a boring operation when the spindle 16 is brought into play. Then whenever it is desired to use the chuck 32 to turn a reamer or some other tool, the operator simply bears against the side of the hand wheel 48 to move it over into driving relation with the sleeve 42. After the reaming operation the drive is disconnected from the chuck simply by shifting the hand wheel 48 to its disengaged position. Obviously the attachment makes it possible to perform many operations with the machine that would otherwise require separate and distinct machines, which would mean an expenditure for equipment of many times the cost of the attachment.

I claim:

1. In a machine of the character described comprising a standard, a work table, a bracket movably mounted on said standard relative to the work table and rotatably supporting a boring spindle, a motor fixed to said bracket, and a countershaft driven by said motor received at one end in a bearing in said bracket and having a driving connection with said spindle, a bracket extension providing a bearing for the other end of the countershaft through which the said end extends, a chuck spindle also received in bearings in said bracket extension, said spindle being arranged to drive a tool such as a reamer mounted in the chuck thereof, a worm freely mounted on said countershaft, a worm gear fixed to the chuck spindle and meshing with the worm to complete a reduction drive from the countershaft to the chuck spindle, and a clutch operable at the projecting end of the countershaft for selectively placing the worm in driving relation to the countershaft.

2. In a machine of the character described comprising a standard, a work table, a bracket movably mounted on said standard relative to the work table and rotatably supporting a boring spindle, a motor fixed to said bracket, and a countershaft driven by said motor received at one end in a bearing in said bracket and having a driving connection with said spindle, a bracket extension supported from the main bracket and having the other end of the countershaft extending therethrough for support, said shaft having the free end thereof projecting beyond the brackct extension, a worm mounted freely on said shaft in a housing provided in said bracket extension, a hand wheel keyed on the projectingl free end of the shaft to turn therewith and movable endwise relative thereto, said wheel having projections to engage projections provided on a part xed with said worm whereby the worm may be placed detachably in driving relation to said shaft, a chuck spindle received in a bearing in said bracket extension and arranged to drive a tool such as a reamer mounted in the chuck thereof, and a worm gear fixed on said spindle and meshing with said worm within the aforesaid housing. v

3. In a motor driven machine of the character described, comprising. a bracket, a shaft received in a bearing in said bracket and arranged to drive a member such as a boring spindle, and a driven pulley on said shaft having a belt and pulley connection with the aforesaid motor, a bracket extension formed in three parts, namely, a housing providing bearing support for the other end of the aforesaid shaft, a yoke fitting about the pulley and fastened to said housing and bracket, and an under-arm passing about the pulley and fastening to said housing and bracket, a worm gear fitting freely on said shaft within said housing, a hand-operated clutch for detachably connecting said worm in driving relation to said shaft, a chuck spindle received in a bearing provided by said housing and arranged to drive a tool such as a reamer when the same is mounted in the chuck thereof, and a worm gear fixed on the chuck spindle and meshing with said worm within said housing.

4l. In a machine of the character described, the combination with a work table, a vertically disposed boring spindle movably mounted over the work table, and power means for driving the same, of a chuck spindle horizontally disposed and carrying a chuck on the forward end thereof accessible from in front of the work table, means for supporting the chuck spindle in the aforesaid relation to the boring spindle, a power take-off shaft for transmitting drive from the boring spindle to the chuck spindle, a gear mounted on said shaft, another gear meshing with the latter and mounted on the chuck spindle, and a clutch for transmitting power from the power take-ofi' shaft through said gears to the chuck spindle.

5. In a machine of the character described, combination with a standard and a work table, of a bracket on said standard over the work table, a vertically disposed boring spindle rotatably mounted in the bracket having means for driving the same, a power take-off1 shaft driven with the boring spindle and also rotatably supported by said bracket, a horizontally disposed chuck spindle having a chuck mounted on the forward end thereof accessible from in front of the work table, said spindle also being rotatably supported by said bracket, a gear on the power' take-off shaft, another gear meshing therewith on the chuck spindle, and a manually operable clutch for transmitting drive from the power takeolf shaft through said gears to the chuck spindle.

In witness of the foregoing I affix my signature.

HARRY C. SHOEMAKER. 

